Consolidated Statements of Operations and Comprehensive Income (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Revenue, net	$ 36,768,911	$ 37,001,893
Cost of goods sold	(27,085,734)	(27,781,305)
Gross profit	9,683,177	9,220,588
Selling, general and administrative expenses	1,994,171	2,068,460
Net income from operations	7,689,006	7,152,128
Other income (expenses)
Other income	58,699	20,554
Other expenses	(4,823)	(102)
Interest income	20,983	43,492
Interest expense	(15,884)	(12,965)
Total other income	58,975	50,979
Net income before income taxes	7,747,981	7,203,107
Income taxes (Note 13)	1,340,909	1,277,126
Net income	6,407,072	5,925,981
Other Comprehensive Income
Change in foreign currency translation adjustment	257,984	968,751
Comprehensive income	$ 6,665,056	$ 6,894,732
Earnings per share - basic (Note 11) (in Dollars per share)	$ 0.33	$ 0.31
Earnings per share - diluted (Note 11) (in Dollars per share)	$ 0.27	$ 0.25
Weighted average common shares outstanding:
Basic (in Shares)	19,454,326	19,388,260
Diluted (in Shares)	23,673,170	23,591,142